/**
 * Date-format converters for upstreams that don't speak ISO 8601, so an MCP can
 * keep its surface ISO (`yyyy-MM-dd`) and translate at the API boundary.
 *
 * Pair with {@link deepMapStringField} (from the `response` module) to rewrite a
 * date field throughout a response, e.g.
 * `deepMapStringField(data, 'eventDate', dmyToIso)`.
 */
/** ISO `yyyy-MM-dd` → `dd-MM-yyyy`. Non-ISO input is trimmed and passed through. */
export declare function isoToDmy(date: string): string;
/** `dd-MM-yyyy` → ISO `yyyy-MM-dd`. Non-matching input is trimmed and passed through. */
export declare function dmyToIso(date: string): string;
/**
 * ISO `yyyy-MM-dd` (or `yyyy-MM-ddTHH:mm[:ss]`) → a compact `yyyyMMddHHmmss`
 * stamp. A bare date gets `000000`; an already-14-digit value passes through;
 * anything else is trimmed and passed through.
 */
export declare function isoToCompactTimestamp(value: string): string;
/**
 * Today's date in the **local** timezone as ISO `yyyy-MM-dd`. This is the one
 * place a `Date` is deliberately read with local getters — "today" for a user
 * booking a reservation means their wall-clock date, not UTC (resy's
 * `todayYMD`). Pass a `Date` to pin the clock (tests).
 */
export declare function todayIso(now?: Date): string;
/**
 * A `Date`'s **UTC** calendar date as ISO `yyyy-MM-dd` — the UTC counterpart of
 * {@link todayIso} for APIs whose day boundaries are UTC (creditkarma's
 * `utcDateString`).
 */
export declare function toIsoDateUtc(d: Date): string;
/**
 * Shift an ISO `yyyy-MM-dd` date by `days` (negative to go back), staying
 * calendar-correct across month/year boundaries and leap days. The arithmetic
 * runs entirely in UTC so a behind-UTC local zone can't shift the result (the
 * classic date-only off-by-one). Non-ISO input is trimmed and passed through,
 * matching the module convention.
 */
export declare function shiftIsoDate(date: string, days: number): string;
/**
 * Normalize a time to `HH:MM:SS`: a bare `HH:MM` gains `:00`, an `HH:MM:SS`
 * passes through, anything else is trimmed and passed through. The inverse
 * direction of the zod module's `extractTime` (which trims seconds OFF), for
 * upstreams that require the seconds field (resy's `padSeconds`).
 */
export declare function ensureSeconds(time: string): string;
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